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Add check in from_to_step

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radrow 2021-06-25 11:19:19 +02:00
parent 1975ccf804
commit b366bed24b
1 changed files with 1 additions and 0 deletions
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priv/stdlib/List.aes
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@ -80,6 +80,7 @@ namespace List =
* `b` only if `(b - a) mod step == 0`. `step` should be bigger than 0. * `b` only if `(b - a) mod step == 0`. `step` should be bigger than 0.
*/ */
function from_to_step(a : int, b : int, s : int) : list(int) = function from_to_step(a : int, b : int, s : int) : list(int) =
require(step > 0, "List.from_to_step: non-positive step")
from_to_step_(a, b - (b-a) mod s, s, []) from_to_step_(a, b - (b-a) mod s, s, [])
private function from_to_step_(a : int, b : int, s : int, acc : list(int)) : list(int) = private function from_to_step_(a : int, b : int, s : int, acc : list(int)) : list(int) =
if(b < a) acc if(b < a) acc